1. plants in floodplains often get covered by water during floods. some plants survive the floods because they can continue photosynthesis underwater. however, the plants’ rates of photosynthesis are much lower underwater than above water. which of the following to explain why the rates of photosynthesis are lower underwater than above water? a. there is too much oxygen in the water b. there is no carbon dioxide in the water. c. the chloroplasts do not function underwater. d. the available light is less intense underwater